Journal
CHEMICAL ENGINEERING JOURNAL
Volume 389, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123431
Keywords
Metal-organic framework; Bi24O31Br10 nanosheet; Cr(VI) reduction; White light; Photocatalysis
Categories
Funding
- National Natural Science Foundation of China [21876008, 51578034, 51878023]
- Great Wall Scholars Training Program Project of Beijing Municipality Universities [CITTCD20180323]
- Project of Construction of Innovation Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality [IDHT20170508]
- Beijing Talent Project [2018A35]
- Fundamental Research Funds for Beijing Universities [X18075/X18076/X18124/X18125/X18276]
- Scientific Research Foundation of Beijing University of Civil Engineering and Architecture [KYJJ2017033/KYJJ2017008]
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In this study, the Bi24O31Br10 nanosheets were successfully synthesized using hydrothermal method. Subsequently, series binary BUC-21/Bi(24)O(31)Br(10 )composites were fabricated by facile ball-milling method. The results suggested that the introduction of a specific quality of Bi24O31Br10 on the surface of BUC-21 could enhance the utilization efficiency of white light and suppress the photo-induced carriers recombination to promote the photocatalytic efficiency. The BB-100 (the mass ratio of BUC-21/Bi24O31Br10 being 1) exhibited the best performance, in which 99.9% Cr(VI) ions were photoreduced into Cr(III) upon the white light irradiation within 120 min. As well, the influences of small organic acids, initial pH, light intensities along with the co-existing matters on the Cr(VI) removal were investigated. Furthermore, the Box-Behnken experimental design methodology proved that the photoreduction process was significantly influenced by the co-existing inorganic anions and negatively charged dissolved organic matters (DOM). After 4-run recycling for the adsorption-photoreduction of Cr(VI) experiments, the BB-100 still exhibited satisfied reduction activity with good stability and reusability. A possible reaction mechanism was proposed and clarified through the electrochemical determination, time-resolved photoluminescence decay spectra, active species trapping experiments, electron spin resonance analyses (ESR) and density functional theory (DFT) calculation.
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